Question

what is the colour of residue when crystals of light green iron(||) sulphate are heated in a hard glass test tube?

Answer 1

The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. On further heating, the white substance changes to dark brown solid.

Answer 2

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The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. If it is heated further, the white substance changes its colour to dark brown solid.

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